Coal-drilling machine



(N0 Model.)

J. T. JOHNSON -& T. THOMPSON.

GOAL DRILLING MACHINE.

No. 321,034. Patented June 30. 18-85.

WITNESSES NIPETERS. Photn-Lilhngnphur. wnm m. ma

UNITED STATES PATENT OFFICE.

JAMES T. JOHNSON AND THOMAS THOMPSON, OF XVHAT CHEER, IOWA.

COAL-DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 321,034, dated June 30, 1885.

Application filed April 22, 1885. (No model.)

To aZZ whom it may concern.-

Be it known that we, James T. JOHNSON, and THOMAS THOMPSON citizens of the United States, residing at \Vhat Cheer, in the county of Keokuk and State of Iowa, have invented a new and useful Improvement in Coal-Drilling Machines, of which the following is a specification, reference being had to the accompanying drawings.

Our invention relates to an improvementin coal-drilling machines; and it consists in the peculiar construction and combination of devices that will be more fully set forth hereinafter, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a top plan view of a machine embodying our invention. Fig. 2 is a side elevation of the same. Fig. 3 is avertical sectional view taken on the line as x of Fig. 1. Fig. 4 is a transverse vertical sectional view taken on theline y y of Fig. l.

A represents a supporting-bar for the drilling-machine, which has one end flattened, as at a, and is provided with projecting steel points or spurs b. Thebar is secured in place by inserting its flattened end in a hole drilled in the coal and a wedge, c, which forces the spurs into the coal and securely holds the bar in place. To the outer end of the bar is swiveled a bracket, B, by a bolt and nut, C. The bracket B has two lugs, D, provided with aligned openings, in which are journaled the frame of the machine,- and in one of the lugs 'is made a quarter-circular slot, E, through which passes a set-screw, F, that enters the frame and seen res it in the bracket at any desired angle, while by having the bracket swiveled to the end of the supporting-bar the frame can be turned to any desired point of a circle. The frame G has trunnions H, that enter the openings in thelugs of the bracket and journal the frame therein. The front end of the frame is provided with a curved extension, I, that forms a bearing for a shaft, K, to the inner end of which shaft is fixed a miter-gear pinion, L, and to the outer end of which is secured a crank, M. The frame G has a hinged upper portion, N, and is provided With an interiorly-screW-threaded opening, which passes longitudinally through the frame, between it and the hinged portion N. Through this opening passes a threaded rod, O, which has abitstock, 6, at each end, and to which is feathered or splined a miter-spur wheel, P, with which the pinion L engages. An auger, R, is secured in one end of the rod O. \Vhen the crank is turned, the anger is fed forward, as will be readily understood.

A drilling-machine thus constructed is compact, cheap, and simple, is easily operated,

and can be inclined and turned so as to be used at any desired angle. By lifting the hinged portion of the frame the threaded rod may be removed at any time, and the machine is so constructed as to be readily taken apart and packed for transportion in a very small space.

We are aware that it has been heretofore proposed to construct drilling-machines that are adapted to be inclined and turned, so as to work thedrill at any desired angle, and this, broadly, we disclaim.

Having thus described our invention, we claim- 1. The combination of the supporting-bar, the bracket B, swiveled thereon, the frame G, journaled in the bracket,and having the curved extension or arm I, the screw O,working in' the frame, the mitered gear-wheel P,feathered or splined on the screw, the mitered pinion L on a shaft journaled in the arm I and meshing with wheel P, and a crank for rotating the pinion, substantially as described.

2. The combination of the supporting-bar, the bracket B swiveled thereon, having the lugs D, and the segmental slot E in one of said lugs, the frame G, journaled in the bracket and having the curved arm I, the screw 0, working in the frame, the miter-gear wheel P, feathered on the screw, the miter-pinion L on a shaft journaled in arm I, and meshing with wheel P, a crank for rotating the pinion, and the set-screw F,passing through slot E and entering frame G, for the purpose set forth, substantially as described.

In testimony that we claim the foregoing as our own we have hereto affixed our signatures in presence of two witnesses.

. JAMES T. JOHNSON.

THOMAS THOMPSON.

'Witnesses:

JAMES GLARKsoN, H. G. PALMER. 

